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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892a3f89b1555df044c1b0678178db56fa86e960430424cd4a05d4bceff6504c' 
  AND token = 'THRFPnVulKRLCrv5vkmhZU0esymGXQ77btGFBfc4KEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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