SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d439b872fd67d01a7faef7cca999bc5cb6d0c31a8f5fd5ead5dd923cba8285' 
  AND token = 's21pkJY7V8i/KxvD9U/HuMtlg8zLAK9Pt3oS0yXpSqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00149

JSON explain

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