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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c4c14727e91f6db179cd81cfa00a55eb4ae1334cc575f3b1b345287751f90c' 
  AND token = 'jP59S4dbfkyOrNoejVnGnnlHT50PYwfJcWiZ6hWSW98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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