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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4fce4165a53f53fa2b08c7028aee9518f3b1c70da978219334b69359cdc210' 
  AND token = 'H0t0LiyYk4vY5jXNOL8JXC9qrXVaUv3rabfiZ8rtHic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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