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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67d130b1e7c56fbf84c77ba16428567fec42a9003451390cc3c6c4ea2ae4a3d' 
  AND token = '5NuV07i5i+CXBL0CRtKslryrukwKHq1Hib69NM7U12Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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