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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e72ba8f077f4743ae800839f6a68561396f0789cfa165e4e6ba1e37ee9d16a' 
  AND token = 'cM5Tgx0ye7N8FwdRVdb2f6loXlf6cxVXXgy3YbCSnUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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