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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f289c689bfe4ba3707fa4ba259900774542582f11db2aa5174c3776a52ecf4a' 
  AND token = 's9g6sidJL7rlJq627xZQ4UUZEQ7A+pEjHb16kVfvTDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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