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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba28cb0629c0f3d87f1d2b03841c4e296d760fd240195fba8a3c0ff42b4cb36a' 
  AND token = '7nYJ7+AIN0Zdmee6/dDaudxCfUyD3+zGT16QcrT1WrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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