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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f61a19b5abea05ad26d5e2b5dbaeaf463be45cff147828dbe1a4636f8cb784a' 
  AND token = 'IBYtaNloO8fC6X6KVlonhaBXFke0gFlyjank6SieV4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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