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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcbb982de2bc1ff76599e298b493558af05f57befee01d8b682f53ef4796ec0' 
  AND token = 'NRIRhwN6EE57VZ4ynXWp5ZL6wdHXqzFA15pzGA7j0t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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