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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898e8d9d63142f7faf0dc0aa7d8fb816f39d52b9705c07a3746a932a3914a0aa' 
  AND token = 'ISomuRraBEBx/gRtBpIJybjhWgDP1VWQmbv4HpAuMkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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