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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3e6a97a47c98838ccd23eed25b334cd0749850741b9ed6dd80eeab140616e8' 
  AND token = 'p4T/rHjtSzQ2XS61gEAjLVo83PtoDpURI5cJtSj5Hvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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