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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec1cbab3adc3e694e1f1ebf2a467ffbd5299739443e1859c93e3b83d2ae2a36e' 
  AND token = 'zlnZPf8fpRkrJY4Y1hoQPQOkeQ7KIHcUj/8nH2uvo8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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