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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c2ae1f267ecf923bedb0c8d4a36830a3b2ab82a7c86ad1ae76452438a2881a' 
  AND token = 'OkTml1UoYTkIj10uJ6+JxN/JLRKYHGentWcM1KvsBwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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