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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4861a258fcea73f27963311a4828057c340c11b96e8e831181b4e13c00004744' 
  AND token = 'cijwFjHdd+ZQYpVaf+REeaGjiUEwzZwlI9V0SffEs80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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