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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532dc9df84ad52a318329ce0f7102912d53b9d4493aa74cb52e59dd8a2779148' 
  AND token = 'BbLFHbPriKuOEoWGiX/2EufZa//11x88GhIo4l5QwRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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