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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b99e507952e6932d97732ed323356eb3e19fd0bf82ac8640b56f32fce2a8266e' 
  AND token = 'q5CjMcLrFlt8+qX/b4guRiP7O5vvW8gl1yZOj9btOJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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