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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b9de817e880d623e2c567fee6c474a3504490bf4f7e080c2d7a0e80198b472' 
  AND token = 'b0aEDuILQlIjHyyoeMfjd3qcesMpA2anskCsm/kV+Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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