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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382d5ce3bd6616b742eb8f329fd62edf8a37bb30aaf9719fae93f49be460c132' 
  AND token = 'TkFeLz6n6n11NaEkbcS3m1ZOwjvm4ycqVtsnikQbA8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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