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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bcf48e65a161b4d076defedcf4bb8cfbcf0743df3e7ebe009e4f9c2836953b' 
  AND token = '4gglJS/UH7QiDhbnDZQecQMB0s9+dZVkh8VKNoQM0FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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