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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1680c47b209024211f8c17ba1aaaa4972e81ac1ce298a8b095f80c72959cd191' 
  AND token = 'ibK1DkgZjeGyj8l+t/c+8DsP4+7ssH25HgVBwpJbqvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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