SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c87bc3dbe6b2e31bbbc39d475fb4d8fc7d827fca8c2fd87874ee47410e553a7' 
  AND token = 'sSp7VhdLKIHHgJtdIfDlytVZjUq8uYu/wTG19YKj9NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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