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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03c18322e813d27d1ff9612ff13d10006230344573654553b659bf5fec1a336' 
  AND token = 'PPNyqFnk2af034DuV6cf2O478F5FnM11nlju+k4Pj5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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