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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a8eda290845e44bd2dae9d3ee894a47ce8609384b3f9fefa43ccde3a87dcad' 
  AND token = 'gQW5S4oKPEskUu3cahMIqtjudFwe66xLBHDxsWuMhzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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