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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9675335b62c4a7fef69a9a37fc39cd1d77c58c5bf3863155b1cbf11b51110a5c' 
  AND token = 'lbVttrEJmmuN8yWqotGECJm3sajQAJhwWt6lxdzdKjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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