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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d60d614cf2e7b10c990a458cd2b84e12e9426b0f80a5f23ac65c258a42adbcd' 
  AND token = 'sKtqgr3v05pyvzvD2WaTt627Oz5FcSekY5sc5V+ECXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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