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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88e9a88dbfeb2ce5ce9f7794724c0cc75028bb72e5cc1a265fb96cb2b62cd7e' 
  AND token = 'gpgxaWJq1+mXo6r3yD/+vhDknadBfmDcfpNOTHQmGLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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