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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a235dc6819f7bde8ccb555a3747d446e2eafdadb3a3e77ac4d5d0fa39c21f92' 
  AND token = 'URqEvgCQDU+Wl7mUMKJkdFOPQAp63JwO/ateeR0+zUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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