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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9a92fbce7a79668b5b071c95ea16775e390a439d4bc025838ca2905eac6dfd' 
  AND token = 'dSpKYF0vl6DCBTnrq+wqSE+Go03bILuGo6v4m0vAH5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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