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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77880c95664cf52c42d1e7b9f170e2c00e9f138f153cc4e2dfce239fedad168b' 
  AND token = 'dgOdfjU+FNj7ZKE5L11jeJkIYm2ihqsDEnEozKXMONM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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