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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c42f2b50820ae47b7eb15c8a185f5b67ce9dcded0d47c45fb636a1e28fa703' 
  AND token = 'eo/d4j53IDRG3JrB1X3sGpwuVtH37FtbjLxPAWrgooI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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