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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471cc992f4bbb5ca609c625b3dc921fac8277e513aaa8e9466ff2b6ad95ee114' 
  AND token = '0DqTW2K02A3sAJYlSmdg4k2Z+WHCr/hXHGOqrBWX0fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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