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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a962d5be9f93415f0bf76dd4988fa1441d27a96c17b3b2d4d76ce44e88496e07' 
  AND token = 'J04hN9LsmwIBnKxYwV0GsVhTET98eEVkBKDejP7puic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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