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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb1227acbf6a145161b3ff14f8d631803d5bfe85f8dee335a25af217e6701b2' 
  AND token = 'oAhaekdc1yShCqG+15JFSyk1erSnsrLk+/JZU9oy0K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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