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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2716b182a9218dd4cac3811c7f3ba1d45af654e2bd9d02e73378f577cdf91721' 
  AND token = 'bq9NordwMmeghajJ7yZ9YRaXz8FW8IERbNf/ZrMJIrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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