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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e7c4e8fcc90831b292fe33176c082434cd3e26f909cbb454997f4aa07c4253a' 
  AND token = 'nCId4/++RNwLbe1K0njkkHPZTJ6U0nQ8JHsGne2SzM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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