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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34dde5cb87a46d134d7a4c4c8f63fc4fcb8d454be366575f7fea45e3e587fb12' 
  AND token = 'En9bXpK8+1xcx7on81kOhGKK7dbP/8OKJ3EfGS3WHHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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