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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f7f4b615ea0a4b308ecfc743d7f4f101a3d7cd7d2f473b07cf8acdd849f736' 
  AND token = '6dcQFGvBJRSXrAG4Zx3AHabHo/8jFH9uwqfeJqI81/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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