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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '333b0087098bbb0f8fcd6c4939e51ea01cb407403b51662ac38ed09a17287e25' 
  AND token = 'sJNF2E/17uAp4gHHJlbNM5iZNZXPhZu1AHn6OsrqCdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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