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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332f1c9c71bc7c2c3627978e48ab86063ebd9c94e9caa9dbbf564134587eb832' 
  AND token = 't6RSNz/vW5lH3v1F1YykILtJ5Yr3RaKp2osU6TTnzqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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