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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b9679356c4fa1c664a110a3bb72a7c70db71bd384b325dd14aa05431cc5bd5' 
  AND token = 'Nk84YlpiRmiqFW1B2nA7/xt7rlIY8cD98f1k3SH7tAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}