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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa92ae68d1b9aa08fd136de9e9d67f26028ac07e2d79a2257f0377ce5d9da091' 
  AND token = 'qlbVfO2GxzVKPyyc5JvZeozLzr4opA7k/5PN3ucNydY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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