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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764846e81e645b01ac488d1999884c66c1b0684eafd993489c9e74d19528a8c3' 
  AND token = 'Sm/tS1F0HcrmIzoFTBOUAXRGYTrbUd7WUGKUWzXJ/sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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