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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6dbc088fde5df48b3ba4df5fb1ece088b9f19feb976cd287595e08aa26a101d' 
  AND token = '1ZYK3OSuD1bNuXEoTpifmoGpae1lqgITC1fRJsPX5y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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