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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926cce72fd8d7f0ca62cb4295cae76bee5637afe6571e2cda178b41e11ae4aca' 
  AND token = '0HnN8w490FdH8aohPO8SL4iSQ9WYcc5Ww9LO09UaxnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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