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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd16a3fd7e5e73987617a99eaf3d37bbc5e4b236b9aa62d7e7f3f72a52d35c246' 
  AND token = 'k1O7HNKZBv6oxhkzif7BLtnkq2/SD/i3bULiiImQAa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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