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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe827ce80bffc3826c7ceff9d1c9a36ce6a4ffb8fd84731ece6ab6b649e1a03d' 
  AND token = 'aNoGCUlTPiY0utFlBJQrxUfi3b5zyJj+JKt0Q889FSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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