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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d717f6c92e8d429e8bcba1e0ee51e4b8b86b83d65042018c6749016deb07c60' 
  AND token = 'DSv5MkGrAermqC4YHUlJaVgyrd+7F7efWan9ib5Lyvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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