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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9614688dac9a854e7f1bafa6f2c7d8dc43279faa2e8da2ea872a80d38531f821' 
  AND token = 'Po850zSXrG/h0iClSJBbq24iXpEg4HoR6frqEhNl/AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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