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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6a0eeee16e0792aa6ba51009046a1a338c87efe51a97f1dd9ed9d283e4ae46' 
  AND token = 'd7yIAEhutG0Lnmi8KGeyhpNYBgO3+cATPMJ/lx/iv/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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