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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbeef190a613a6b0e662c3f9eb6eb9971f9a3e876d56a4406bbb55764ff134aa' 
  AND token = 'suBD1kl0ZjbHfdyZ6kHgLtXkE5fc2zMgulbRuICeXa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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