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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d20d84370f5992ce9dfda8d6885ae12bedd302c8f1c60321423dd3ab526b84f' 
  AND token = '14qKJkQ1bZPgDxeRAiXsM61YhMrylYhTa+A4PzAV+KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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