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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c630363e434fb970cf5c4615e6fc096437b7baef64bee1bf89743750c04a5f5' 
  AND token = '+XhkjE9ODuRi2BgPavrd76ksHdoTObEqL8wbp81l6EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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