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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79a9c04d8460944bd84d7478fa25ea657f235b2ef31b9e3e35df728ce09229c' 
  AND token = '2wwxma1Dyqtc0403Fp10grr5NCd/7h7Nkhwy+cp0A+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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