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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40df5e1d166e127e3333b2d9d68920b123c14ecbb41d68d7a3c4c75bb0bd31e8' 
  AND token = 'ws4y19VGjiBNhWjS1B2KQhn047i8zFYfD9erH+UV+WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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