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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe6477d5be600f95eb0366d806406af552b6582552b8651a3b51e96a18d2868' 
  AND token = 'f8sgcDB6tK8wDm0NZMLSuaZQWVKTIW/Um8L5n660cWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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