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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35caa6b525bdcd77738cb3c4470e095c9d4b7d415cb8b323024843c5d084e381' 
  AND token = 'g5ga2GfkPtd8N1VNjBnOZr8nu0lLHvtDaH80RFCkxfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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