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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c34cbb05cfc40dcecce4f4de94e748de9ccd5409e45eb13157757798255c7334' 
  AND token = 'eEk8nqAr5W+ffTKfYO4bke0RPkYL9FBmKqFubb+4mHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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