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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e2d0a664ea47a30b62e1eba33cc292c8a965591f4deaace530592bbc987124' 
  AND token = 'sdyMo27w74IaKzITFn6UfcDf4NmCA+REQm2PzYD4w9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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