SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772210f099a6bf16baff9604e66c118e3f28b50a6a13cf0f6704a8b225795654' 
  AND token = 'tJ4hMPOcItnlpWLZiy3AmqA/bhVpCMziXNZ86UoxBRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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