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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75c2fd6d9e321bf47c73c42790d90a1c92db6cb2ab46502918c578d9cec327c' 
  AND token = 'gjF35imJZepAFxoVsGO3F7HLKJFP6QbzVyn8u0NyDTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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