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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dd4f2a8152dfb81e15e5dc9f7ebec660feba8bcbb3227372a7d5f4bbdeb79c' 
  AND token = '4FaAhdCBgMxw1NzKeiPwlu31zpaQojvZkTJmSa3acT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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