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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba789a840b2fdbbf0add2e00cb07f3197497ebf125a8337b61d5f46403f7eec' 
  AND token = '8cNAKPp+5anQOQH5Mhl0szEzCf5fefXwT6OC4BNffbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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