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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09643f65f29ee001026bebd21e8c054a739a6fd6d9da8c1f99f929f4d87c76d' 
  AND token = '1Kx5hEjgce0/wo9xNf4Y1MUVc+Otf3bTzsdOg+QwC/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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