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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a218820d07414d7fc6b2bbf3d80344539832f52185fc001b6e678e3f55df3d08' 
  AND token = '3QsxNBERRp96RlN++o4u6tArqlhilEd9V2GVw+1H7CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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