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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b8ba6ede35789ec9565b53ee8024037cbdebce1dd94ecedeb277e87f5a4e7f' 
  AND token = '0veoPNNBzq8DMjUHmD6Wofn896gvnXHRuuQ5VXVkzaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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