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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863e278365e7d480e38c03067b2602c047fe23ccaa3e1a6e70e2eefd9b695a25' 
  AND token = '1sIZp6PtCTscWaHFoOe4IMLGJoXOjb99KkTURfixjig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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