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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b635db92e1afaa30495ae462ee156bc919d3d5ba682b9117e8f31c44e83cd62' 
  AND token = 'Rk6g5rnBchF79KPlgobNTqaCumGPnCP7UTRqHOoADNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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