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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb33413e5785a4d71fc97387ba04b4bb19036d3829e4eb8e7b86fca6e8c8d6d' 
  AND token = 'LWw8p4C3fqVKQzwZtS7ilg5t9z9TuobTrWehllwBs4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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