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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e2daf76bbf531a21806bec193fd3c60d9a4d1345a40c784d3347d66c576753' 
  AND token = '1wTFSDDKFjU8KFubnAre5jcxMWJrZctb3X2kComGoNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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