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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891f9d73138962e951018c5ae7c36f5e7bc8f80f92e202584eef2b11f0440c8c' 
  AND token = 'DQlONsnqUoblvwNp/m+IqfxCiL7KdO6Ru034KT0ERlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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