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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799b85047a358b91cd8cef81cf424c6e3fbcbe648e9e5393cec6ec6ff91fa349' 
  AND token = '+VFrPb5QbgFzpVP9OeFkFJN1/Zlrso98MwIgWQ0ifSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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