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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f936f3cf3ec74be055979c75722357fece444626bcdc53a876a05865e0c531d' 
  AND token = 'MSl1GmptIzg5eHssxehTeeESeC+oWgq/CPfV1tq3A18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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