SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9eae7411d0a24c39c05c74ed461aad5fd1c45570d5f401a0ab7bf8039db00a' 
  AND token = 'HzVFXL+o7Tho4oqZeKnew/sYBLi6FZvxxGB1NJ3f8FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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