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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6beadf4564f44b5b9ea0cf0471e754967b64df3bfd91490b271a4fbe21b6b63' 
  AND token = 'iP4iZ+wlnevwSbtSK872FRs2tG6STYfV6w3l3r00zaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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