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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277045579bc3dfb01a1ed9b554d9cebcebe04784e77596530c60e4c651ae4355' 
  AND token = '21uMIch1d6gsNW0tTw4QJPasSuRO5CRU7Dfqw2tqU+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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