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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1580e5ed6ec567211a70c5c44c603ed4cd19a86a98d819cae0a0daebc8b39eed' 
  AND token = 'Yv6CqHG/lbPYZrj7pO1W9vSsSzlmo9DqhO2HX/XTnaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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