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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b96d098f5fd22c2bdf817bd6e71a9df2ed40ad67fafc1c350cd87a6148a66f' 
  AND token = 'myoYrWfEy0wtNTkoen3rwkN3/0P99Ir2JJ99E/I5qoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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