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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a1d276920ce6f013939624680e5042bec15c42061ce222dad59f610938a057' 
  AND token = 'J3K9IpBwwrf+zO9qiktxodo6BlcfeE+D63G87TVoS3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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