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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a81cb0296909884f23e3e421ad8df9679caf3149e9e8b6e89fe7d00c0328cb4' 
  AND token = 'g0luvZMnqGNORGOzYz4g6mYkoCTH9ebP48ybx+7EsjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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