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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609b618f7c4fe6ae66b66186979fea3d6643c9472fe8e899162fbec094f44513' 
  AND token = 'vtKmS7MK8pUCcmXtiF0c2BL43CBIlrBeHiUOe/W/9mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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