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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d28baed5de9b44f838d2b8e6c0718ae899dbe1d41082c0f7b436ce13dd2821f' 
  AND token = 'h0B+gzcwo8O+1p/PT+cSkcxKV+KqkwNlaJRabhCYiEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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