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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdc3af0da733345296549e45feccefbd8f32d5eb9f2d34bc23379a8fadfadc8' 
  AND token = 'kzM9XrS1veH9/Ruc7eG0WoM+BJEj55/buLqqOtA5LnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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