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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a569ac58aac4e0764e4438c2e761bc924021e93265df87359a61d76f8a29a5a5' 
  AND token = 'k3Y7I/u3ZImN34+WfCFbfkorbR6zOpIL0Q7Bzl5WL7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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