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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f236cb7f4eb29f3e6f2dfeee7eb8d8287555e194fa926a8cb31f2263ecbc6a7' 
  AND token = 'xQe+M09AgRM1ETouTqBzcZtePpT6wfcDDu/z9K4G85A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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