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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6486bfe230202ca1179f945cf40e8999c1b5b565de1191a348755ebcc1e19751' 
  AND token = '+dgiJhv7PmnGurveNkDZxl02Wc8JSBSg4DWmF2464No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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