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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '901fcc11471d16a57e2fcfa2f89209c42357b0ed199732dde48fac61824833f3' 
  AND token = 'lqu9QPmfU1opylb1SJf7MqYzK74uAFjOE6Ob9j54yPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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