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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b0897a949483c98e0d521745cc4c771f62e1a66e9bcf8673d7604a3879670e' 
  AND token = 'qZAFmtAcolsYPHdcQPNnp8UQ4dgobRcT6F5i/jU7ges=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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