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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81de1fd14aa98591fe54a6d3de15413821273b4d2db43344566607626813d07' 
  AND token = 'w7IpdH5Y5KjK3EEgfR50T50UqQkYb8EpgT+Z5MOoJpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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