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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2881526ac5109a54dec2ff15604af370afb9f8f6fca81ea27c57728e665fd57' 
  AND token = '0lOSUUh8AiOQkja7wDBGS5/gsSydLEHL4XaYAWhET50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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