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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a7d99692186957b3d3120b4213243a07e8e0ee1ef40d6f62b7633be3f75ee3c' 
  AND token = 'hXGrAOPoSO+pa8x0ua/uIXi0sKaTYcrXCxIpVrteLGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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