SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99fbd993835908b6d22067b6d8841fae8d627320c9ef5a6329f18f46c12365fa' 
  AND token = 'IOQUVZGhAuf6xQiD7JPA/j1llEctK845NYiNxEj7jgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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