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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc5965aa4266f7aae7d5cdd694e2cfda30b468bb50ae4629dc31d388d288f9d' 
  AND token = 'G5ejZM4v76Auh8bFq8LVZU/dVhgMGabZipOar4rwDOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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