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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e3555b282a200dd39b3136763a26280d2ab1a69acd71e460170c8f6ae2bef2' 
  AND token = 'IvOJxnjC5ISdEKCibFtv1E2O6jr1gc5AgJSD+KOzHTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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