SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd76dc91f1b9a2759096a80645656331ddd7c94d8b3f3883eac9313c2f57f66' 
  AND token = 'rs271DJ0Y3N+AnvtJUNJfmmYHSOmyBZsG+6T/zgGhHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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