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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db247793f7cfa3f1dc3a0caa88fbdc779e2dfc3270c3731e3e668f8d58d96f9' 
  AND token = 'w070YYMKpIYuU5raaS2qTUeHNDScC54Dj4dft0oEpns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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