SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4ff5de7eeb8701194a9af020f66a6857a987c94ea7a2aa87800ddbe5a67912' 
  AND token = 'B+oZu9WgS5KzqvG+zHppdwO5o2ONMGtgvqGsLh1YL8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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