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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f12c7d77c42b7527764e1a5b45d70053fdac3d82ba9c2b76a3201fafc58373' 
  AND token = 'vFkXt+6NPT5r9UhEtaQAKf7tupC5e3tLqTp6I2/60H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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